Answer
Always true
Work Step by Step
$nC(n-1) = n$
$n!/(n-(n-1))!(n-1)! = n$
$n!/(n-n+1)!(n-1)! = n$
$n!/1!(n-1)! = n$
$n*(n-1)!/(n-1)! = n$
$n=n$
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